First-time grower here. Can anyone help me diagnose this? I'm growing Blueberry autos under some HGL Quantum boards in soil (Fox Farms) they are in tall 5 gal pots. Everything was going great until a few weeks ago and now this looks pretty bad. Some of the stems of the leaves you can pull right off. I have been watering between 6.5 - 6.8 since day one.